Catholic High Sch 2006 PSLE Math Prelim Q44

The figure is made up of three squares A, B and C that overlap each other. The area of square A is 20% that of Square B, where the area of square B is 60% of square C. What is the ratio of the shaded area to the unshaded area?


(Shaded area)
B – A ----- 6000 – 1200 = 4800

(Unshaded area)
C – shaded area ----- 10 000 – 4800 = 5200

Shaded Area : Unshaded Area
4800 : 5200
12 : 13 (Answer)